Late last year I was going to build the Sidewinder CNC based on Dave G. plans but after some feedback I've decided to start from scratch and design my own. Phase 1 are the linear bearings for the X and Y axis. I wanted a modular design so I could crank out as many linear bearing assemblies as needed. I decided to go with 2" conduit for the rails (maybe overkill) and a bearing assembly "block" that can be placed wherever design dictates. I finished the prototype in MDF and so far it seems to have worked out pretty good.
https://youtu.be/9A2_wVjZmuc